'''Yggdrasill''' (イグドラシル, ''Igudorashiru''), also referred to as "[[God]] of the [[Digital World]]" (デジタルワールドの神, ''Dejitaru Wārudo no Kami''), is the mysterious {{w|host computer}} that rules over the Digital World on one of the [[server]]s on the [[Network]]. It is named after the {{w|Yggdrasill|giant ash tree}} that connected the {{w|Norse_cosmology#Nine Homeworlds|nine worlds}} in {{w|Norse mythology}}, tended by the {{w|Norns|three Norns}}, after which the Terminals in the [[NEW Digital World]] that Yggdrasill created are named.

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'''Yggdrasill''' (イグドラシル, ''Igudorashiru''), sometimes spelled '''Yggdrasil''' and also referred to as "[[God]] of the [[Digital World]]" (デジタルワールドの神, ''Dejitaru Wārudo no Kami''), is the mysterious {{w|host computer}} that rules over the Digital World on one of the [[server]]s on the [[Network]]. It is named after the {{w|Yggdrasill|giant ash tree}} that connected the {{w|Norse_cosmology#Nine Homeworlds|nine worlds}} in {{w|Norse mythology}}, tended by the {{w|Norns|three Norns}}, after which the Terminals in the [[NEW Digital World]] that Yggdrasill created are named.

It has created an avatar in the form of "[[Yggdrasill_7D6]]".{{refd|Yggdrasill_7D6|yggdrasill7d6}} [[Shakamon]] is rumored to be the being closest to Yggdrasill in the Digital World.{{refd|Shakamon}} Yggdrasill gathered the [[Royal Knights]] in order to manage the world,{{ref|''{{url|p-bandai.jp/b-boys-shop/item-1000089867/|Premium Bandai: Digimon Adventure Digivice Ver.15th}}''}} and even modified the code of [[Craniummon]]'s armor, changing it into [[Black Digizoid]].{{refd|Craniummon}} It seems that its will will eventually lead the Royal Knights to cross servers to [[Digital World: Iliad]] and meet the [[Olympos XII]] face-to-face.{{ref|''{{url|p-bandai.jp/b-boys-shop/item-1000089867/|Premium Bandai: Digimon Adventure Digivice Ver.15th}}''}}

It has created an avatar in the form of "[[Yggdrasill_7D6]]".{{refd|Yggdrasill_7D6|yggdrasill7d6}} [[Shakamon]] is rumored to be the being closest to Yggdrasill in the Digital World.{{refd|Shakamon}} Yggdrasill gathered the [[Royal Knights]] in order to manage the world,{{ref|''{{url|p-bandai.jp/b-boys-shop/item-1000089867/|Premium Bandai: Digimon Adventure Digivice Ver.15th}}''}} and even modified the code of [[Craniummon]]'s armor, changing it into [[Black Digizoid]].{{refd|Craniummon}} It seems that its will will eventually lead the Royal Knights to cross servers to [[Digital World: Iliad]] and meet the [[Olympos XII]] face-to-face.{{ref|''{{url|p-bandai.jp/b-boys-shop/item-1000089867/|Premium Bandai: Digimon Adventure Digivice Ver.15th}}''}}

Very similar to the case of Chronicle, it maintained the Digital World and Digimon as part of an artificial life experiment run by an unknown party. Eventually, Digimon multiplied until its memory started to overload, causing the Digital Hazard. It activated Project Ark, using the X-Program to eliminate 99% of Digimon, saving the remaining 1% for follow-up experiments in a New Digital World. However, another 1% of the Digimon population managed to survive by developing the X-Antibody, giving them a resistance to the X-Program and mutating them into newer forms.
Yggdrasill dispatched the Royal Knights to hunt down the X-Antibody Digimon, which they did in the belief they were preventing the destruction of the Digital World.
However, Yggdrasill was programed to intervene in and administrate problems in the Digital World, but decided that it had become too complicated and needed to be done away with entirely to keep order, so it unleashed a plan to delete all Digimon.
Yggdrasill was eventually destroyed by the Royal Knights Alphamon and Omegamon, when they realized that it intended to end the lives of all Digimon.

As Digimon multiplied, Yggdrasill became unable to cope with things, causing the Digital Hazard. It activated Project Ark, using the X Program to eliminate unwanted Digimon, saving the remaining for follow-up experiments in a New Digital World. This New Digital World consisted of three layers for the past, present, and future - Ulud, Versandi, and Skuld, respectively. In Digimon Chronicle, Shinji is a Tamer of the Royal Knights who works for Yggdrasill.

Bagramon remade the right side of his body with wood from Yggdrasill's server tree. It was also mentioned that Yggdrasill's AI had gone berserk in the past and attempted to destroy the human world, which meant it had to be replaced with Homeostasis.

Yggdrasill is the Host Computer of the Digital World. Some time before the beginning of the story of the game, Yggdrasill spread the Program X to eliminate unnecessary Digimon, thus optimizing the Digital World. Some time after that, it is deactivated.

After being sealed and deactivated within the Infinity Mountain for a long time, Yggdrasill reactivates on its own when it feels the danger that the aritificial lifeform called Vitium represents, and reuses the Program X in order to prevent Vitium from destroying the Digital World.

Several Yggdrasill terminals are fought leading up to the final boss of the game, the main Yggdrasill unit fused with the Mother Eater. Once Yggdrasill is freed from the Eater influence, its normal functionality is restored and it begins repairing the Digital World. Yggdrasill also appears on a Digimon Medal.